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LTC2921 Datasheet(PDF) 9 Page - Linear Technology |
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LTC2921 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LTC2903-1 29031f a (LTC2903-D1, LTC2903-E1) BLOCK DIAGRA S VCC 1 V1 3 V2 4 V3 5 V4 2 GND RESET DELAY GENERATOR 200ms DELAY LOW VOLTAGE PULL-DOWN BANDGAP REFERENCE V1 V2 V3 V4 D1 3.3V ADJ ADJ ADJ E1 5V ADJ ADJ ADJ MONITORED VOLTAGES V1 V1 RST 10µA 6 29031 BD2 POWER DETECT V1 0.5V APPLICATIO S I FOR ATIO Power-Up The LTC2903-1 issues a logic low on the RST output when an input supply voltage resides below the prescribed threshold voltage. Ideally, the RST logic output would remain low with the input supply voltage down to zero volts. Most supervisors lack pull-down capability below 1V. The LTC2903-1 power supply supervisors incorporate a new low voltage pull-down circuit that can hold the RST line low with as little as 200mV of input supply voltage on V1, V2 or V3 (V1 only for options D1 and E1). The pull-down circuit helps maintain a low impedance path to ground, reducing the risk of floating the RST node to undetermined voltages. Such voltages may trigger external logic causing erroneous reset operation(s). Furthermore, a mid-scale voltage could cause external circuits to operate in the middle of their voltage transfer characteristic, consuming more quiescent current than normal. These conditions could cause serious system reliability problems. When V1, V2 and V3 are ramped simultaneously (for options A1, B1 and C1 only), the reset pull-down current increases up to three times the current that may be pulled with a single input. Figure 1 demonstrates the reset pin VCC (V) 10 1000 10000 0 0.8 1.2 29031 F01 1 0.4 0.2 1.0 0.6 100 V1 = V2 = V3 V1 ONLY TA = 25°C VRST = 0.3VCC Figure 1. RST Pull-Down Current vs VCC |
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Similar Description - LTC2921 |
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